The concept of keyword stuffing is the frequent repetition of relevant keywords. The aim of this constant repetition is to obtain a high ranking in search engines. Search engines are based on the premise that increases the relevance of the website for a special issue with the frequency of occurrence of the keywords. Extreme stuffing is practiced by invisible (for the user) endless repetition of keywords. This form, which can be seen only by the robots of search engines, is counted as a spam, during his identification. So, the certain website comes into the blacklist of the search engine and gets the complete opposite of what he wanted (namely a high ranking). This method (called "sledgehammer approach" by search engine optimizers) is nowadays technically obsolete.